Tbiple valve



IE P. MURPHY@ TIIIPL'E vALvE. APPLICATION PILEII'IIILY I3. I9I5.

1,1 95,388. Patented Aug. 22,1916.

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J. P. MURPHY, TRIPLE VALVE. APPL'ICATIONHLED JULY 13.1915.

1,195,388 PatentedAug. 22,1916.

` I 2 SHEETS-SHEET 2- WWI 27 JOHN l. MURPHY, 0F CHARLESTGN, SOUTH CARULINA.

TRIELE VALVE.

Specification of Letters Eatent.

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Application filed July 13, 1915. Serial No. 39,545.

To all whom t may concern.'

Be it known that l, JorrN P. MURPHY, a citizen of the United States, residing at Charleston, in the county of Charleston and State of South Carolina, have invented certain new and useful Improvements in Triple Valves; and 1 do declare the following to be a full, clear,oand eXact description of the invention, such as will enable others inthe art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to air brake systems, but more particularly to triple valves of both the plain and quick acting type, and' the invention has for its object to provide improvements in the slide valve by means of which the said slide feed valve is caused to operate more eectually and to be maintained in serviceable condition for an indefinite period.

In slide feed valves of triple valves the usual construction and arrangement is such that the valves quickly become worn and inefficient to such an extent that they have to be frequently replaced, thus constituting the cause of considerable trouble and difliculty.

lt is for the purpose of obviating and overcoming the present disadvantages in the slide feed valve of triple valves that l have made this present invention, 4 which consists in the novel construction and arrangement of the slide feed valve foninsuring a proper seating yof the same, and for maintaining the same in yits proper operative position in service, thereby preventing the necessity of frequent repairs and replacements.

The invention further consists in the novel details of construction and combinations of parts, all of which will be first fully described and afterward specifically pointed out in the appended claims.

Referring to the. accompanying drav ings-Figure 1'is a view partly in vertical section of a plain triple valve constructed in accordancewith this invention. Fig. 2 is a similar view illustrating the slide feed valve in the position it assumes when the distributing valve is in operative position. Fig. 3 is a detail sectional view through the slide feed valve, and Fig. 4 is a transverse sectional view through the same.

Like numerals of reference indicate the same parts throughout the several figures, in which- 1 indicates the triple valve which may be of theplain or high speed type and 2 indicates the slide feed valve structure as a whole.

'lfhe piston 3 is mounted on the stem 4 which extendsithrough the valve chamber 5, the said chamber 5 being provided with a flattened longitudinal seat G upon which the flat face 7 of the slide valve 8 operates. rlhe slide valve 8 is bifurcated so as to straddle the stem 4 of the piston 3 and includes the plunger 9 of the graduating valve 10, the said plunger 9 being tapered at 11 to conform to its seat 12, so as to close the distributing port 13 in the slide valve 8, which port enters the flat face 7 of the said slide valve in the manner as shown in Fig. 3, while the said flat face 7 of the slide valve 8 lis provided with a longitudinal recess or chamber 14 so as to connect the brake cylinder pressure port 15 and the relief port 16 when the said slide valve is in position shown in Fig. 3.

The plunger 9 is provided near its outer end with a transverse pin 17 which enters a perforation in the piston stem 4 so that the plunger 9 will be caused to move with the stem 4 to seat and unseat the graduating valve 10. Theslidey valve 8 is of such a length that a space exists between the ends thereof and the shoulders 18 and 19 on the piston stem 4. From this it will be understood that upon movementof the piston stem 4 said slide valve does not move until one of its ends is engaged by one ofthe shoulders 18 and 19 of the stem 4. Referring to Fig. 3 it will be seen that upon movement of the piston and its stem 4 to the left the pin connection 17 between theplunoe 9 of the graduating valve and the stem will instantly move said plunger to the left to unseat thesame, for the reason that the slide valve 8 will not be moved until the end thereof is engaged by the shoulder 19, while a movementof the'stem 4 in the opposite direction will first seat the plunger 9 of the distributing valve before imparting any movement to the slide valve 8.

'Referring particularly to Figs. 3 and 4 it will be seen that the stem 4 is provided with a central boss 20 and a transverse opening 21 which receives a coil. spring 22 and a headed plunger 23, which engages vtra Y the brakes.

the outer end of the coil spring The inner end of the coil spring 22 bears against a slide 24; which is provided centrally With a small boss 25 entering the coil spring 22, the said slide 2-1 bearing against the slide valve 3. By means of this construction the coil spring and headed plunger are always held in proper operative position and are guided by the stein Ll, While the necessary relative movement between the stem l and the slide valve 8 is assured. 1t Will be further apparent from an inspection of Figs. 3 and l that the tension of the spring 22 to hold the slide valve 8 effectively in its seat 6 can be accurately determined and maintained so that it is possible to apply any desired pressure on the 'slide valve 8 by lengthening or shortening` the spring 22, While any appreciable Wear between the slide valve 8 and its seat 6 can be quickly and effectually taken up by the insertion of a shim under the head of the headed plunger 23, as illustrated at 2G in Fig. 2. By means of this simple and effective construction the slide valve 8 can be maintained in ellicient operative condition for an indefinite length of time. i

Having thus fully described the invention its operation is as follows: The port 27 in the valve casing connects With the engineers brake valve by means of Which the train pressure is led to the triple valve to act against the outer surface of the piston 3 to move the same into position shown in Fig. 1.

The port 2S connects With the auxiliary reservoir through which pressure enters the chamber 5 to act on the inner surface of the piston 3. The position of the piston 3 is therefore determined by the relative pressures entering the ports 27 and 23. In the bushing 29 in which the piston 3 operates there is provided a groove 30 so that when the piston is in position shoivn in Fig. 1 pressure from the port 27 passes to the chamber 25. As the pressure is relieved in the port 27 the piston 3 is caused to move outwardly and upon initial movement of the piston and its stem 4 the plunger 9 of the graduating valve is moved from its seat into position shown in Fig. 2. l/Vlien the shoulder 19 engages the slide valve 8 said slide valve is caused to move With the stem l until the port 13 in the said slide registers With the port 15. Pressure then passes from the port 28 through the chamber 5 into the transverse arms of the port 13 and into the port 15 for the ordinary service application of the brakes. Upon further reduction of pressure in the port 27 the slide valve 8 passes entirely beyond the port V5 allowing direct communication between ports 2S and 15 for emergency application of Upon restoration of pressure in the port 27 the piston 3 is caused to be Y moved into its normal position shown in Fig. 1, the initial movement of which seats the plunger 9 of the distributing valve as shown in Figs. 1 and 3.

From the foregoing description taken in connection with the accompanying drawings it is apparent that the slide feed valve is susceptible to changes in construction and arrangement of the parts, and 1 consider myself clearly entitled to all such modifications as fall Within the limit and scope of the appended claims: Y

1. A triple valve, including a chamber therein, a valve including a piston and stem disposed in said chamber, a bifurcated slide straddling the said stem, said stem being pro-k vided ivith a transverse perforation, a headed pin-arranged in said perforation and guided thereby and having itsheadin engagement With the Wall of said chamber, a slide dis posed'under said headed pin, a coil spring disposed on said headed pin and having one end in engagement with said last inentioned slide and its otherrrend in engagement` with said pin to force the said pin and said last mentioned slide oppositely to securely maintain the first mentioned slide in intimate contact with the flat bottom of said longitudinal channel., the said first mentioned slide and the last mentioned slide being capable of relative movement, substantially as described. Y

2. A triple valve, including a slide feed valve having a chamber provided with a longitudinal channel, a valve including a piston and stem in said chamber, said chamber being provided With ports, tvvo of Which enter the same in said longitudinal channel, a

bifurcated slide mounted on said stem and operable in said longitudinal channel to com-V mand one of the ports therein, the said'slideV Y being provided With a port adaptedto'register With one of said ports in said channel, y

means connected to and operable by said stein to open and close said port in said slide, the said slide being provided Witha longitudinal chamber to effect communication between said ports in said casing, the stem being prol VVvided with a transverse perforation, a pin in Ygitudinal channel, ports entering said lchannel, a valve including a piston and stein op'-V erable Within said chamber, a slide mounted onV said stem and movable relatively te the Y saine and operablewithin said longitudinal channel, said slide being provided With a port adapted to register With one of said ports enteringV said channel and provided nel, means connected to and operable by In testimony whereof, I affix my signature, moif'ement of said stem to open and close said in presence of two Witnesses. port in said slide, a pin disposed in said stem .JOHN P. MURPHY. and having one end in engagement With the Witnesses:

I Wall of said Chamber, a spring on said pin in JOHN L. HEIDTMAN,

said stem to elleetually maintain the said C. J. MURPHY.

With means for eecting communication beslide in intimate Contact With the bottom of tween both of sald ports entering said ehansaid longitudinal channel.

Copies of this patent may be obtained for ve cents each. by addressing the Commissioner of Patents, Washington, D. C. 

